Modular lens adapters for mobile anterior and posterior segment ophthalmoscopy

ABSTRACT

A modular lens adapter system or kit is provided for mobile anterior and posterior segment ophthalmoscopy. Equipped with various lens adapter modules, respective lenses and a mobile imaging device, a user is provided with tools for various mobile ophthalmoscopy imaging applications. Eye care practitioners can use their existing lenses to customize the modular lens adapter system in a cost-effective way, which allows for mobile and remote capture, viewing, and utilization of clinical images. The various modules are also adaptable to nearly any type of phone or tablet regardless of its dimensions or presence of a protective case. The invention also addresses the need for fewer, smaller, less expensive, and easier to use ophthalmic imaging equipment, which is further important in enabling a broad base of users.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/623,298, filed Jun. 14, 2017, titled “MODULAR LENS ADAPTERS FORMOBILE ANTERIOR AND POSTERIOR SEGMENT OPHTHALMOSCOPY,” now U.S. Pat. No.10,092,182, which is a continuation of Ser. No. 14/893,951, filed Nov.25, 2015, titled “MODULAR LENS ADAPTERS FOR MOBILE ANTERIOR ANDPOSTERIOR SEGMENT OPHTHALMOSCOPY,” now U.S. Pat. No. 9,706,918, which isa national stage filing under 35 U.S.C. § 371 of PCT/US2014/040203,filed May 30, 2014, titled “MODULAR LENS ADAPTERS FOR MOBILE ANTERIORAND POSTERIOR SEGMENT OPHTHALMOSCOPY,” now International PatentApplication Publication No. WO/2014/194182 which claims priority to U.S.Provisional Patent Application Nos. 61/896,011, filed Oct. 25, 2013,titled “3D PRINTED SMARTPHONE LENS ADAPTERS FOR MOBILE ANTERIOR ANDPOSTERIOR SEGMENT OPHTHALMOSCOPY,” and 61/829,548, filed May 31, 2013,titled “SMARTPHONE LENS ADAPTERS FOR MOBILE ANTERIOR AND POSTERIORSEGMENT OPHTHALMOSCOPY,” each of which is herein incorporated byreference in its entirety.

FIELD

This invention relates generally to ophthalmoscopy. In particular, theinvention relates to lens adapters for mobile ophthalmoscopy that can beused in a modular fashion with mobile imaging devices, like smartphones.

BACKGROUND

Over the past decade, ophthalmic imaging has moved rapidly from film todigital. However, most of today's gold standard digital fundus cameras,for example, are large, expensive tabletop medical devices onlyavailable in eye clinics. With the advent of the smartphone and everimproving built-in cameras rivaling point-and-shoot pocket digitalcameras, eye care providers have the opportunity to capture high qualityimages anywhere using their existing lenses without the need forexpensive equipment. Combined with ubiquitous fast wireless internet,cloud storage, smartphone-enabled electronic medical records, andencrypted messaging, a modern smartphone can now be instantlytransformed into a low cost, portable, ophthalmic imaging camera. Thepresent invention advances the art by providing a customizable adaptersystem or kit for mobile anterior and posterior segment ophthalmoscopy.

SUMMARY OF THE DISCLOSURE

A modular lens adapter system or kit is provided for mobile anterior andposterior segment ophthalmoscopy. Equipped with various lens adaptermodules, respective lenses and a mobile imaging device, a user isprovided with tools for mobile ophthalmoscopy. The user can setup forvarious mobile ophthalmoscopy imaging applications like:

Posterior segment ophthalmoscopy using the ophthalmoscopy lens adapterwith the mobile imaging device and its internal (variable intensity)light source.

Posterior segment ophthalmoscopy using the ophthalmoscopy lens adapterwith the mobile imaging device and an external (variable intensity)light source.

Posterior segment ophthalmoscopy using the ophthalmoscopy lens adapterwith the mobile imaging device using the (variable intensity) lightsource of the macro lens adapter (without the macro lens mounted).

Anterior segment ophthalmoscopy using the macro lens adapter and mounteda macro lens with the mobile imaging device optionally using the(variable intensity) light source of the macro lens adapter, where theophthalmoscopy lens adapter is detached from the mobile imaging device.

Anterior segment ophthalmoscopy using the macro lens adapter and mounteda macro lens with the mobile imaging device and its internal (variableintensity) light source, where the ophthalmoscopy lens adapter isdetached from the mobile imaging device.

Iridocorneal angle ophthalmoscopy (gonioscopy) using a modified macrolens adapter that allows mounting of a gonioscopy lens with the mobileimaging device optionally using the (variable intensity) light source ofthe macro lens adapter or the mobile device's internal flash.

With the embodiments of this invention, eye care practitioners can usetheir existing lenses to customize the modular lens adapter system in acost-effective way, which allows for mobile and remote capture, viewing,and utilization of clinical images. The various modules are alsoadaptable to nearly any type of phone, tablet, or other mobile imagingdevice regardless of its dimensions or presence of a protective case.The embodiments also address the reduced need for extra ophthalmicequipment, which is further important in enabling a broad base of users.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an ophthalmoscopy lens adapter 100 according to anexemplary embodiment of the invention.

FIGS. 2-3 show macro lens adapters 200, 300 according to exemplaryembodiments of the invention.

FIGS. 4-5 show exploded views of the mobile ophthalmoscopy system or kitaccording to exemplary embodiments of the invention. FIG. 4 shows partof ophthalmoscopy lens adapter 100 with macro lens adapter 200. FIG. 5shows part of ophthalmoscopy lens adapter 100 with macro lens adapter300.

FIGS. 6-9 show various views of the mobile ophthalmoscopy system or kitaccording to an exemplary embodiment of the invention with the mobileimaging device and its casing to which the ophthalmoscopy lens adapter100 and macro lens adapter 200 are adapted. FIG. 6 is a top view, FIG. 7is a frontal view showing the coaxial alignment of the lenses, FIG. 8 isa three-dimensional view, and FIG. 9 is a side view.

FIGS. 10-13 show various views of the mobile ophthalmoscopy system orkit according to an exemplary embodiment of the invention with themobile imaging device and its casing to which the ophthalmoscopy lensadapter 100 and macro lens adapter 300 are adapted. FIG. 10 is a topview, FIG. 11 is a frontal view showing the coaxial alignment of thelenses, FIG. 12 is a three-dimensional view, and FIG. 13 is a side view.

FIGS. 14-15 show various views of the mobile ophthalmoscopy system orkit according to an exemplary embodiment of the invention with themobile imaging device and its casing to which the ophthalmoscopy lensadapter 100 and macro lens adapter 200 are adapted. FIG. 14 is athree-dimensional view, and FIG. 15 is a side view. In both exampleslens mount 120 has been folded (flush) with respect to the telescopingarm 110, which has been minimized in size by sliding segment 112 withinsegment 114. The sizing of the opening 126 of the lens mount 120 matchesthe diameter of the arm segment(s) 112, 114 of the telescoping arm 110.

DETAILED DESCRIPTION

In a first embodiment of the invention a modular lens adapter system orkit is provided for anterior and posterior segment ophthalmoscopy in amobile fashion. In a second embodiment of the invention a modular lensadapter system or kit is provided for anterior, posterior, andiridocorneal angle segment ophthalmoscopy in a mobile fashion. Adaptermodules for imaging each of the eye segments can be removable attachedto a mobile imaging device as desired by the user making mobileophthalmoscopy possible.

Examples of mobile imaging devices are phones, smartphones (e.g.iPhone), tablet computing devices (e.g. iPad), high definition webcam(but wired and wireless), as well as digital cameras and video cameraswith wireless and/or Bluetooth connectivity, all with at least a cameraoption for making still images and/or video. The exemplary embodimentsare portrayed with an iPhone and different adapter modules, althoughthese embodiments are easily adapted to other smartphone brands andmobile devices as specified above.

Posterior Segment Adapter Module

A first adapter module as shown in FIG. 1 is an ophthalmoscopy lensadapter 100, which can be used for imaging the posterior segment of aneye. In this example, the ophthalmoscopy lens adapter 100 has atelescoping arm 110 with two segments 112, 114, where segment 112 canslide within the shaft of segment 114. In another embodiment, there arethree or more telescoping segments that enable the adapter to collapseto a smaller size and extend to a broader range of lengths. In yetanother embodiment, there is only one segment, which is not telescopicand at a fixed length.

The slideable shaft allows for adjustment of the working distance(adjusting the focal point) between the mobile imaging device and anophthalmoscopy lens mounted to ophthalmoscopy lens adapter 100 via lensmount 120. The telescoping arm 110 can vary the working distance of lensmount 120 (i.e. the mounted ophthalmoscopy lens) relative to the mobilephone mount 130 in a range of 1 cm to 20 cm. To assist in maintainingand/or guiding of a desired working position of segment 112 with respectto segment 114, an array with bumps 112″ can be fabricated along the topsurface of segment 112. Inside the shaft of segment 114, facing towardthe bumps 112″ one or more bumps (not shown), with similar dimension asthe bumps in array 112″, could be positioned such that they would lineup with bumps 112″ and provide relatively more friction to assist in themaintenance of the desired working distance of the telescoping arm 110.The one or more bumps within segment 114 could be positioned anywhereinside the segment wall of segment 114. In a preferred embodiment, theone or more bumps could be positioned on the inner wall of therectangular portion that is created by slits 114″. The rectangularportion facilitates easier sliding of the shafts as it decreases thefriction between the bumps of segment 112 and 114 due to the fact thatthe rectangular portion would slightly bend outward with respect to itssegment.

A telescoping arm like 110 is one of the various possible mechanisms toadjust the working distance, as a skilled artisan would appreciate.Various other mechanisms could also work, such as folding or collapsingarm segments with joints and therefore the invention is not limited totelescoping segments. The objective of the telescopic arms or even thefolding or collapsing arm segments is that the size can be minimized foreasy storage. In one example with the same objective of minimizingspace, the telescoping arms could also be separated from each other.

Telescoping arm 110 has two ends: one end 112′ for segment 112 and theother end 114′ for segment 114. At end 112′ lens mount 120 is attached.In the example of FIG. 1, lens mount 120 is adapted or movably fixed tosegment 112 by means of a joint or hinge mechanism, which is made up byjoint/hinge parts 122 and 124. The joint mechanism allows lens mount 120to be rotated in different positions with respect to segment 112.

Lens mount 120 is sized to accommodate an ophthalmoscopy lens (notshown) in the range of 10D to 60D, such as a 14D, 20D, 22D, 28D, 30D,40D, or 54D condensing lens for indirect ophthalmoscopy. The workingdistance between lens mount 120 and the mobile imaging device is about5.75″ in the case of an iPhone couple to a Volk Panretinal 2.2 lens, butwill vary depending on the combination of mobile device andophthalmoscopy lens power. Ophthalmoscopy lens can be easily mounted andremoved from the inner diameter 124 of lens mount 120. In a preferredembodiment, inner diameter 124 of lens mount 120 has a slightlyundersized fit to allow gripping of the ophthalmoscopy lens for easyinsertion and removal. In another preferred embodiment, opening 126would be desirable to make the ring of lens mount 120 more flexible toallow easy insertion and removal of the ophthalmoscopy lens. Anotherdesign objective of opening 126 relates to minimizing space for theophthalmoscopy lens adapter 100. It could be desirable that the lensmount 120 can be folded to be parallel and flush with the telescopingarm 110 to minimize space (see FIGS. 14-15). In other embodiments, aclamp mechanism can be used to hold the lens. The clamp could utilize aratchet type mechanism, a spring mechanism, an adjustable belt, a vice,an elastic band, or screws that can be adjusted to hold the lens inplace. In one example, it could be desirable that the ophthalmoscopylens adapter 100 be minimized in size so that it can be stored in apocket of a garment, e.g. a pocket of a doctor's coat. Regarding weight,the ophthalmoscopy lens adapter 100, without holding the ophthalmoscopylens, is preferably less than 100 grams (e.g. made from a polymer or alightweight metal, such as aluminum) and can be manufactured with anytype of process including injection molding and various 3D printingprocesses.

At end 114′ a mobile imaging device mount 130 is attached to which amobile imaging device can be removably held. In a preferred embodiment,the inner spacing 130′ of the mobile imaging device mount has a slightlyundersized fit to allow gripping or snap fitting to the mobile imagingdevice or casing of the mobile imaging device for easy attachment andde-attachment. The mobile imaging device mount could be adjustable toaccommodate any sized phone or casing, either through an elasticmechanism, a spring mechanism, an adjustable belt-type mechanism, a visemechanism, or other type of mechanism that would allow the mount to gripthe phone and hold it in position.

Further to the importance in the design and minimization of space of theophthalmoscopy lens adapter 100 is the structural aspect of anun-encased optical pathway between the mobile imaging device mount 130and the ophthalmoscopy lens mounted in lens mount 120. In addition, theophthalmoscopy lens adapter 100 of this invention does not need or haveany reflective mirrors.

In another embodiment, the adapter could also include a spacer elementthat protrudes from the shaft on the ophthalmoscopy lens side thateither can rest on the patient's face (such as on the cheek under theeye) or can rest on the user's thumb while the index finder is used tohold the patient's eyelid open. The spacer element may be straight,curved, contain a ring element that can fit around the user's thumb,and/or contain a padding element that rests on the patient's face. Thespacer element may also be adjustable in length and be telescoped backinto the adapter's main shaft or be folded back on to the adapter's mainshaft.

Anterior Segment Adapter Module

A second adapter module (FIG. 2) is a macro lens adapter 200, which canbe used for imaging the anterior segment of the eye. The macro lensadapter has a mount for a macro lens 210 capable of showing a close up,focused, magnified view of patient's anterior eye structures. The macrolens is either completely removable or can be reversibly positioned infront of the mobile device camera lens through either a sliding,magnetic, or hinge mechanism. The macro lens may be a commerciallyavailable macro lens manufactured specifically for smartphones. In thisexample, macro lens 210 distinguishes a holding area 212 and a lens area214. Macro lens 210 can easily be inserted or removed from open slotarea 220 of the macro lens adapter 200. Open slot area 220 is sized suchthat when the macro lens 210 has been slit into open slot area 220 auser will be able to view the lens area 214 of macro lens 210 throughopening 222. The macro lens adapter 200 further distinguishes a lightsource 230, with an on/off switch 240, to focus light onto an eye.Preferably, the light source 230 is an LED light source with anadjustable intensity that can be adjusted with, for example, dialcontrol 250. The control element for the LED intensity may be a dial,but could also be, but not limited to, a knob, a sliding switch, ahaptic touch button, or a button. Macro lens adapter 200 can be adaptedto the mobile imaging device by using any type of attaching means suchas Velcro, a snap fit mechanism, a slide-and-hold mechanism or the like.For this adapter the back area (facing into the figure) is adapted tothe mobile imaging device.

FIG. 3 shows another embodiment of the second adapter module. Macro lensadapter 300 has a macro lens 310. In this example, macro lensdistinguishes a holding area 312 and a lens area 314. Macro lens 310 caneasily be inserted or removed from open slot area 320 of the macro lensadapter 300. In this example, macro lens 310 can be a single-focus lensor a manually adjustable focus lens where hold area 312 can be used formanual focusing. Open slot area 320 is sized such that when the macrolens 310 has been placed into open slot area 320 a user will be able toview through the lens area 314 of macro lens 310. The macro lens adapter300 further distinguishes a light source 330, with an on/off switch 340,to focus light onto an eye. Preferably, the light source 330 is an LEDlight source with an adjustable intensity that can be adjusted with forexample dial control 350. Macro lens adapter 300 has a bracket 350 witha space 352 which is defined to fit the width of an area of a mobileimaging device so that the macro lens adapter 300 can either be slitonto (when bracket 350 has no joint mechanism) or clipped onto (whenbracket 350 does have a joint or spring mechanism) the mobile imagingdevice. For this adapter the back area (facing into the figure) isadapted to the mobile imaging device.

In another embodiment, the macro lens can be fixed within a wider slotand able to slide onto and off of the front of the mobile device cameralens. In yet another embodiment, the macro lens can be magneticallyattached to the front of the adapter and can slide onto and off of thefront of the mobile device camera lens. In still another embodiment, themacro lens can be hinged to the front of the adapter and can bepositioned via the hinge onto and off of the front of the mobile devicecamera lens. The macro lens may have a focal length ranging from about 1cm to about 20 cm.

Iridocorneal Angle Segment Adapter

A third adapter module is a gonioscopy lens adapter for imaging theiridocorneal angle of the eye. The gonioscopy lens adapter is able tohold a gonioscopy lens such as, but not limited, to a Goldmann 3-mirrorlens, a Sussman gonioscopy lens, a Posner gonioscopy lens, or a Koeppelens and could be a single focus lens or an adjustable focus lens. Thegonioscopy lens adapter is similar to the macro lens adapters 200, 300where instead of using a macro lens a gonioscopy lens can be used, butis positioned in such a way that the illumination from the LED lightsource passes through the lens, and the gonioscopy lens makes contactwith patients eyes to eliminate total internal reflection, which is aprinciple that is known in the art of gonioscopy.

Variable Light Source

A fourth adapter module is a variable intensity light source. In oneembodiment, the variable intensity light source is an external variableintensity LED, which can be removably adapted to the mobile imagingdevice as shown in FIGS. 2-3. With respect to the use of ophthalmoscopylens adapter 100, the light source of macro lens adapter 200, 300 can beused for application of the ophthalmoscopy lens adapter 100. When bothadapters 100 and 200/300 are used in conjunction, the macro lens orgonioscopy lens for adapters 200/300 can be removed so that these lenseswould not interfere with the posterior segment analysis of the eye.However, absent of adapters 200/300 either the ophthalmoscopy lensadapter 100 could (i) have its own built-in variable light source forexample of the mobile imaging device mount (not shown), or (ii) use avariable light source built-in to the mobile imaging device or operablevia an application running on the device in connection with e.g. aflash. Key to the use of the ophthalmoscopy lens adapter 100 is the factthat the variable intensity light source can be coaxially aligned withthe ophthalmoscopy lens and the lens of the mobile imaging device. Keyto the use of the macro lens adapters 200/300 is the fact that thevariable intensity light source can be coaxially aligned with the macrolens or gonioscopy lens.

Ophthalmoscopy System or Kit Modularity

FIG. 4 shows an exploded view how the ophthalmoscopy lens adapter andthe macro lens adapter 200 can be adapted to a mobile imaging device 410(here portrayed as an iPhone). In this example, a casing can be usedthat would allow both adapters to be easily connected. Casing could havetwo parts, 420, 422 that could be snap fit onto mobile imaging device410 or to each other. Parts 420, 422 could fully enclose the mobileimaging device 410 yet allowing for an opening for the screen/buttonarea of the mobile imaging device 410, or partially enclose where thereis at least no enclosing part for the screen/button area of the mobileimaging device 410. Part 420 distinguishes an area 430 to which themacro lens adapter 200 can be placed/positioned. Part 420 also featuresan opening 432 that lines up lens of the mobile imaging device 410 andthe macro lens mounted in open slot area 220. Preferably, the macro lensfits as close as possible to the lens of the mobile imaging device. Inaddition, the macro lens should be coaxially aligned with the lens ofthe mobile imaging device. A ridge 440 is featured on part 420 andserves as a guide to place mobile imaging lens mount 130 onto part 420,which allows for proper coaxially alignment of the ophthalmoscopy lenswith the lens of the mobile imaging device.

FIG. 5 shows an exploded view how the ophthalmoscopy lens adapter andthe second example of the macro lens adapter 300 can be adapted to amobile imaging device 410 (here portrayed as an iPhone). Similar to theexample in FIG. 4, the macro lens fits as close as possible to the lensof the mobile imaging device. In addition, the macro lens should becoaxially aligned with the lens of the mobile imaging device.

Having a system or kit with the various lens adapter modules, respectivelenses and the mobile imaging device, a user is equipped with tools formobile ophthalmoscopy. The user can setup for various mobileophthalmoscopy imaging applications:

Posterior segment ophthalmoscopy using the ophthalmoscopy lens adapterwith the mobile imaging device and its internal (variable intensity)light source.

Posterior segment ophthalmoscopy using the ophthalmoscopy lens adapterwith the mobile imaging device and an external (variable intensity)light source.

Posterior segment ophthalmoscopy using the ophthalmoscopy lens adapterwith the mobile imaging device using the (variable intensity) lightsource of the macro lens adapter (without the macro lens mounted).

Anterior segment ophthalmoscopy using the macro lens adapter and mounteda macro lens with the mobile imaging device optionally using the(variable intensity) light source of the macro lens adapter, where theophthalmoscopy lens adapter is detached from the mobile imaging device.

Anterior segment ophthalmoscopy using the macro lens adapter and mounteda macro lens with the mobile imaging device and its internal (variableintensity) light source, where the ophthalmoscopy lens adapter isdetached from the mobile imaging device.

Iridocorneal angle ophthalmoscopy (gonioscopy) using a modified macrolens adapter that allows mounting of a gonioscopy lens with the mobileimaging device optionally using the (variable intensity) light source ofthe macro lens adapter or the mobile device's internal flash.

Variations

The position of the lens mount of the ophthalmoscopy lens adapter shouldalways coaxially aligned with the lens of the mobile imaging device.However, the telescopic arm (or equivalent mechanism) does not have tobe mounted as shown in the figures since the mobile imaging device mountcould take various shapes and be adapted at various locations withrespect to the mobile imaging device.

The telescoping arm can be permanently or reversibly mounted to themobile device case. In either case, the telescoping arm may be foldablesuch that the arm and lens mount distal to it are moved aside to allowthe user to hold the mobile device closer to the patient's eye whenusing, for example, the macro lens adapter. The telescoping arm may beattached to the case of the phone either through a two-point fixationundersized gripping mechanism as shown in the drawings, or through othermechanisms such as a depression within the case that fits thetelescoping arm (female-male connectivity), a reversible locking fitwherein a button is pressed to release the arm from the case, a magneticattachment mechanism, or a suction attachment mechanism.

The aperture of the LED light source could be adjustable to createvarying diameters for the collimated beam. Blue, red-free, and othertypes of lighting may be used, and infrared lighting may also be used.In addition, various filters could be used for the light source, forinstance, to physically reduce the intensity of the light. This methodcould be used in place of the variable intensity light source, toprovide one or more barrier-type filters for the light. Examples of suchfilters are neutral density filters and polarizing filters.

In addition, certain elements may be positioned in front of the cameralens to enhance image quality. Such elements include, for example,additional lenses that will serve to increase the magnification of thevirtual image created by the ophthalmoscopy lens seen on the mobileimaging device screen (e.g. to enable to occupy a greater percentage ofthe screen area) as well as filtering elements such as polarizingfilters, neutral density filters, and pinhole filters that can reduceglare and light scatter.

The macro lens could be a rotating or sliding macro lens set where usercould select from macro, blue filter, high magnification and wide anglelenses by rotation the lens set in front of the lens of the mobileimaging device (not shown).

The macro lens adapter could further include an eye rest, e.g. acircular protrusion around the macro lens which could be place aroundthe eye, to assist in positioning and stabilizing the macro lens adapterand mobile imaging device system and its various modular forms in frontof the eye.

The variable intensity external light source could be used with orwithout a mirror system or fiber optic element to guide the light.

The battery or batteries for the light source may be enclosed within thetelescopic shaft, which would have a dual effect of favorably weightingthe device toward the side of the phone and also hiding away additionalbulk on the device.

The external light source and macro lens adapter component can beattachable to the phone either through a clip mechanism or aplate-attachment mechanism to a case. A magnetic mechanism may also beused that attaches these components either directly to the phone or tothe case on the phone.

In all cases, the phone may be attached directly to the components ofthe kit or in part through a case, which can be positioned around thephone either through a slider-case configuration (as shown in thefigures) or a grip-fit configuration wherein the material of the case isflexible enough to surround the phone.

An external fixation target could be added for the opposite eye that canbe a blinking light or other form of adjustable fixation target. Amoveable extension with a blinking light tip could be plugged into aphone audio jack or directly to the adapter itself (such as to thetelescoping shaft or another part of either the anterior or posterioradapter) to direct a patient's gaze toward the light.

The LED light could be focused into an adjustable slit beam that can bedirected through the cornea at an angle, mimicking the action of atraditional slit lamp. The LED light may also be set to a fixedintensity (without a variable intensity function).

The system could be enhanced to have a dedicated software applicationrunning on the mobile imaging device to assist in image capture, lightcontrol, image analysis, image enhancement, data storage and datasharing as are common features of applications running on, for example,smartphones.

What is claimed is:
 1. A modular lens adapter system for mobileposterior segment ophthalmoscopy, comprising: (a) a variable intensitylight source; (b) a mobile imaging device mount; (c) an extendable armhaving a first end and a second end, wherein the first end is coupled tothe mobile imaging device mount; (d) a lens mount coupled to the secondend of the extendable arm, the lens mount configured to removably mountan ophthalmoscopy lens; wherein the extendable arm can be manipulated toposition the ophthalmoscopy lens within the lens mount coupled to thesecond end of the extendable arm at various distances with respect to alens of a mobile imaging device when coupled to the mobile imagingdevice mount while maintaining the ophthalmoscopy lens in coaxialalignment with the lens of the mobile imaging device, and wherein thevariable intensity light source is positioned to be coaxially alignedwith the lens of the mobile imaging device when coupled to the mobileimaging device mount.
 2. The modular lens adapter system of claim 1further comprising a hinge to couple the second end of the extendablearm and the lens mount.
 3. The modular lens adapter system of claim 1wherein the mobile imaging device mount is sized to position the modularlens adapter system in relation to the lens of the mobile imagingdevice.
 4. The modular lens adapter system of claim 3 wherein the mobileimaging device is a phone, a smartphone, or a tablet computing device.5. The modular lens adapter system of claim 1 wherein the extendable armis sized so as to position the ophthalmoscopy lens coupled to the secondend of the extendable arm at a working distance from 1 cm to 20 cm withrespect to the lens of the mobile imaging device while maintaining theophthalmoscopy lens in coaxial alignment with the lens of the mobileimaging device.
 6. The modular lens adapter system of claim 1 whereinthe lens mount has an open ring with an inner diameter selected for anundersized grip of an ophthalmoscopy lens sized from 10D to 60D.
 7. Themodular lens adapter system of claim 1 the lens mount furthercomprising: a ratchet mechanism, a spring mechanism, an adjustable belt,a vice, an elastic band or screws to releasably secure theophthalmoscopy lens within the lens mount.
 8. The modular lens adaptersystem of claim 1 wherein the mobile lens adapter system weighs lessthan 100 grams when the ophthalmoscopy lens is not present in the lensmount.
 9. The modular lens adapter system of claim 1 wherein the lensmount may fold onto the extendable arm.
 10. The modular lens adaptersystem of claim 1 further comprising a series of complementing bumpsspaced along the extendable arm wherein engagement of complementingbumps aids in maintaining a desired working distance of the lens mounton the second end of the extendable arm from the lens of the mobileimaging device.
 11. The modular lens adapter system of claim 1 whereinthe mobile imaging device mount is undersized to provide a releasablesnap fit onto an outer casing of the mobile imaging device.
 12. Themodular lens adapter system of claim 1 the mobile imaging device mountfurther comprising: an adjustable mechanism to accommodate a range ofsizes of an outer casing of the mobile imaging device mount.
 13. Themodular lens adapter system of claim 1, wherein the ophthalmoscopy lensadapter has an un-encased optical pathway between the mobile imagingdevice mount and the ophthalmoscopy lens.
 14. The modular lens adaptersystem of claim 1, wherein the variable intensity light source is anexternal variable intensity LED adapter, configured to be removablyengaged with the mobile imaging device.
 15. The modular lens adaptersystem of claim 1, wherein the variable intensity light source is builtinto the mobile imaging device mount.
 16. The modular lens adaptersystem of claim 1, wherein the variable intensity light source is an LEDlight wherein the intensity is adjusted by a dial, a knob, a slider, ahaptic touch button or a button.
 17. The modular lens adapter system ofclaim 1, wherein the variable intensity light source has a clip adaptedto couple to the mobile imaging device.